WIP: CI: Only test py27 @ w32

Author: phdru

.github/workflows/run-tests.yaml

@@ -9,13 +9,9 @@ jobs:
 
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest]
-        python-version: ["2.7", "3.5", "3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "=3.9[build=*_pypy]"]
+        os: ['windows-latest']
+        python-version: ["2.7"]
 
-        include:
-        - os: ubuntu-latest
-          os-name: Linux
-          pip-cache-path: ~/.cache/pip
         - os: windows-latest
           os-name: w32
           pip-cache-path: ~\AppData\Local\pip\Cache